https://kb.wisc.edu/helpdesk/page.php?id=592;;;
tags: Windows - Taskbar Has Disappeared from the Desktop | start button missing;;;
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Open the Task Manager using either
Ctrl+Alt+Del or Ctrl+Shift+Esc.
If explorer.exe is already running, select it and choose End Task before continuing on.
Click the File menu and select New Task.
In the dialog box, type 'explorer.exe' to restart the process.